<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Document</title>
  <style type="text/css">
    .container .cart {
      width: 300px;
      margin: auto;
    }

    .container .title {
      background-color: lightblue;
      height: 40px;
      line-height: 40px;
      text-align: center;
      /*color: #fff;*/
    }

    .container .total {
      background-color: #FFCE46;
      height: 50px;
      line-height: 50px;
      text-align: right;
    }

    .container .total button {
      margin: 0 10px;
      background-color: #DC4C40;
      height: 35px;
      width: 80px;
      border: 0;
    }

    .container .total span {
      color: red;
      font-weight: bold;
    }

    .container .item {
      height: 55px;
      line-height: 55px;
      position: relative;
      border-top: 1px solid #ADD8E6;
    }

    .container .item img {
      width: 45px;
      height: 45px;
      margin: 5px;
    }

    .container .item .name {
      position: absolute;
      width: 90px;
      top: 0;
      left: 55px;
      font-size: 16px;
    }

    .container .item .change {
      width: 100px;
      position: absolute;
      top: 0;
      right: 50px;
    }

    .container .item .change a {
      font-size: 20px;
      width: 30px;
      text-decoration: none;
      background-color: lightgray;
      vertical-align: middle;
    }

    .container .item .change .num {
      width: 40px;
      height: 25px;
    }

    .container .item .del {
      position: absolute;
      top: 0;
      right: 0px;
      width: 40px;
      text-align: center;
      font-size: 40px;
      cursor: pointer;
      color: red;
    }

    .container .item .del:hover {
      background-color: orange;
    }
  </style>
</head>

<body>
  <script src='https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js'></script>
  <div id="app">
    <my-cart></my-cart>
  </div>

  <script>
    // 标题区域
    const carttitle = {
      props: ['uname'],
      template: ` <div class="title">{{uname}}的商品</div>`,

    };
    // 列表区域
    const cartlist = {
      props: ['mylist'],
      methods: {
        delItem(id) {
          this.$emit("remove", id)
        },
        addItem(id) {
          this.$emit("add", id)
        },
        subItem(id) {
          // console.log(id);
          this.$emit("sub", id)
        },
        changeItem(id, event) {
          if (!Number(event.target.value)) {
            return event.target.value = 1
          }
          this.$emit('change', {
            id: id,
            val: event.target.value - 0
          })
          // console.log(event.target.value);
        }
      },
      template: `
          <div>
            <div class="item" v-for="item in mylist" :key="item.id">
              <img :src="item.img" />
              <div class="name">{{item.name}}</div>
              <div class="change">
                <a href=""  @click.prevent="subItem(item.id)">－</a> 
                <input type="text" class="num" :value="item.num" @change="changeItem(item.id,$event)"/>
                <a href="" @click.prevent="addItem(item.id)">＋</a>
              </div>
              <div class="del" @click="delItem(item.id)">×</div>
            </div>  
         </div>
  `
    }
    // 底部区域
    const cartfooter = {
      props: ['mylist'],
      template: ` <div class="total"><span>总价：{{sum}}</span> <button>结算</button></div>`,
      computed: {
        sum() {
          var res = 0
          this.mylist.forEach(item => {
            res += item.num * item.price
          })
          return res
        }
      }
    }

    Vue.component('my-cart', {
      data() {
        return {
          uname: '张三',
          list: [{
            id: 1,
            name: 'TCL彩电',
            price: 1000,
            num: 1,
            img: 'img/a.jpg'
          }, {
            id: 2,
            name: '机顶盒',
            price: 1000,
            num: 1,
            img: 'img/b.jpg'
          }, {
            id: 3,
            name: '海尔冰箱',
            price: 1000,
            num: 1,
            img: 'img/c.jpg'
          }, {
            id: 4,
            name: '小米手机',
            price: 1000,
            num: 1,
            img: 'img/d.jpg'
          }, {
            id: 5,
            name: 'PPTV电视',
            price: 1000,
            num: 2,
            img: 'img/e.jpg'
          }]
        }
      },
      template: `
      <div class="container">
        <div class="cart">
          <cart-title :uname="uname"></cart-title>
          <cart-list :mylist="list" @remove="handleDel($event)" @add="handleAdd($event)"  @sub="handleSub($event)" @change="handleChange($event)"></cart-list>     
          <cart-footer :mylist="list"></cart-footer>         
        </div>
      </div>
      `,
      components: {
        cartTitle: carttitle,
        cartList: cartlist,
        cartFooter: cartfooter
      },
      methods: {
        handleDel(id) {
          // 方法一   根据id找索引
          // console.log(id);
          // const res = this.list.findIndex(item => item.id == id)
          // console.log(res);
          // this.list.splice(res, 1)

          // 方法二
          this.list = this.list.filter(item => item.id != id)
        },
        handleAdd(id) {
          // 方法一   根据id找数组的索引
          // console.log(id);
          const index = this.list.findIndex(item => item.id == id)
          // console.log(index);
          this.list[index].num++
        },
        handleSub(id) {
          const index = this.list.findIndex(item => item.id == id)
          if (this.list[index].num <= 1) return;
          console.log(index);
          this.list[index].num--
        },
        handleChange(obj) {
          const index = this.list.findIndex(item => item.id == obj.id)
          this.list[index].num = obj.val
        }
      }
    })

    const vm = new Vue({
      el: '#app',
      data: {},
      methods: {},
    })
  </script>
</body>

</html>